.Putti is the Italian word for little boys, putto singular, putta for little girls - although it is rarely used because it is also short for puttana - which means whore.
Anyway - Christian art still uses putti, with or without diapers, to represent little angels, or cherubs. Proper Christian puritans have taken offense at their nakedness for centuries. Today is no exception. I think women especially are upset by poddies - as my brother and I called the male appendage when we were little. The fear isn't limited to women however. I once knew a Mexican fellow, a sacristan in Boston, who painted sashes over the naked crotches of the little putti rendering their assistance to the Madonna in a painting of her Assumption into Heaven. The pastor never noticed.
The depiction of putti in art dates back to pagan times, as does Christian iconography in general - early inculturation accommodated representation of pagan myth to accord with Christian revelation. The pagans considered putti to be the souls of children who died in infancy - pure, chaste little spirits, rollicking in the eternal bliss of paradise, watching over men and inspiring love and pleasure, helping them in their needs. Christians used them much in the same way - those depicted with wings were angels and even saints - those without were the souls of the unbaptized. (As St. Therese once said, "little children are never damned".) Their bodies, uncorrupted by the sins of the flesh, are gloriously represented in the perfect innocence of little infants... even if they are sometimes mischievous little cupids.
The French and Victorians are responsible for turning these little spirits into insipid, sweet, little sentimental Hallmark cards - all modestly covered up with pink and blue baby blankets, ribbons, or fluffy clouds - or - yuck - hearts.
Nevertheless, putti are more than all of that... they represent the souls of little children - even those millions upon millions who were never allowed to be born - many people call them fetuses - no form or figure or sex or personality...